How to setup a omnitik for a point to multipoint link?
Omnitik is the ap.

SXT's are clients

Do u want to be bridged network or?

Yes one bridge

Omnitik as Ap-bridge on sxt use station wds or station bridge, dont forget to put all ports on omnitik and sxt in bridge

Possible & easy
check here

http://forum.mikrotik.com/viewtopic.php?f=7&t=80479